Punch



(No Model.)

A. A. BAUMENER & J. B. HARTING.

v PUNCH.

No. 485,164. Patented Nov. 1, 1892} UNITED STATES PATENT OFFICE.

ALONZO A. BAUMENER AND JESSE B. HARTING, OF ROANOKE, VIRGINIA.

PUNCH.

SPECIFICATION forming part of Letters Patent No. 485,164, dated November1, 1892.

Application filed March 4, 1892- invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specification.

Our invention relates to that class of punches used for-punching metalplates, sheet metal, and similar articles, in which great power isrequired.

The object of our invention is to provide a punch which can be quicklyapplied to a plunger and one which can be manufactured at a greaterreduction of time and material than those heretofore in use.

To this end our invention consists in the peculiar features andcombination of parts more fully described hereinafter, and pointed outin the claims.

In the accompanying drawings, Figure 1 represents a side elevation ofour device as applied to a plunger in operative position, the plungerbeing shown partly in section to disclose the manner of holding thepunch; Fig. 2,a side elevation of the punch detached from the holder;Fig. 3, a detail view of the segmental grippers, showing the positionassumed in holding the punch; Fig. 4, a detail perspective view of oneof the grippers.

The reference-letter a denotes the shank of the punch proper b. Thelatter is given the usual tapering form and is provided with a point 0.The shank of the punch is given a gradual taper from its upper extremitytoward its junction with the punch proper until the plane of itsexterior intersects that of the punch proper. This wedge-shapedformation is given in order to prevent the shank from pulling out of theholder. Dotted lines 00 x y y illustrate more clearly the taper of theshank portion and punch portion and their relation to each other. Abase-plate d,

Serial No. 423,686. (No model.)

having a diameter equal to that of the plunger, is placed on top of thepunch-shank and extends beyond the sides thereof to form a seat for thegrippers. It will be seen that when the shank is thus formed and placedwithin the grippers f of the holder 9 itcannot possibly pull out of theholder when the punch is withdrawn from the metal. In manufacturingpunches of this formation it will be seen that the bar out of which thepunch is formed can be placed within the spindle of a lathe and thepoint and oppositely-sloping tapers quickly turned down. It will also beobserved that the outer extremity of the punch-shank and the outerextremity of the punch proper are when first formed of sub stantiallythe same diameter, and all the metal lost in turning down is thatconsumed in cutting away the gradual tapers to form the punch proper,the shank, and point.

Our improvement effects many advantages, among which is that of beingable to quickly manufacture a punch of almost any desired size in a fewmoments by an ordinary inachinist when an emergency arises in whichprompt action is essential, as in repairing and constructing bridges,duo.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is-

1. In combination with the tapering shank of a tool, a series oftapering segmental grippers adapted to surround the shank and abase-plate upon which the shank and grippers rest, substantially asdescribed.

2. In combination with the tapering shank of a tool, a series oftapering segmental grippers adapted to surround the shank, a baseplateupon which the shank and grippers seat, and a screw-threaded holderadapted to force the grippers upon the shank, substantially asdescribed.

In testimony whereof we aftix our signatures in presence of twowitnesses.

ALONZO A. BAUMENER. JESSE B. HARTING.

Witnesses W. W. WILLIAMs,

W. H. MoOAR'rY.

